Tektronix TLA 714, Service Manual

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TLA 714 Color Portable Mainframe Service Manual
4–1
Maintenance
This chapter provides procedures for inspecting and cleaning the portable
mainframe, removing and replacing internal chassis components, and isolating
problems to the board or replacement part level.
To repair, you must exchange or replace the failed part; this manual does not
provide component-level procedures for isolating components on the failed part.
Preparation
The information in this chapter is designed for use by qualified service person-
nel. Read the Safety Summary at the front of this manual before attempting any
procedures in this chapter. Refer to the Operating Information chapter for
information on the location of controls, indicators, and connectors used with the
chassis.
Preventing ESD
When performing any service which requires internal access to the portable
mainframe, adhere to the following precautions to avoid damaging internal
circuit boards and their components due to electrostatic discharge (ESD).
CAUTION. Many components within the chassis are susceptible to static-
discharge damage. Service the chassis only in a static-free environment.
Observe standard handling precautions for static-sensitive devices while
servicing the chassis.
Always wear a grounded wrist strap, or equivalent, while servicing the chassis.
1. Minimize handling of static-sensitive circuit boards.
2. Transport and store static-sensitive circuit boards in their static protected
containers or on a metal rail. Label any package that contains static-sensitive
boards.
3. Discharge the static voltage from your body by wearing a grounded antistatic
wrist strap while handling these circuit boards. Do service of static-sensitive
circuit boards only at a static-free work station.
4. Nothing capable of generating or holding a static charge should be allowed
on the work station surface.